Socket of pipe coupling for charging hydrogen



FIG. 1 is a perspective view of a socket of pipe coupling for charging hydrogen when seen from the top and left side of the front, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a centrally cross sectioned front view taken across FIG. 4 along line VI—VI. 

The ornamental design for a socket of pipe coupling for charging hydrogen, as shown and described. 